" wrote:
That's $0.93 PER BLADE.

Do this instead:

While your post was otherwise informative and provides a fine educational
hands-on exercise, the alleged economic justification is, to put it
diplomatically, misleading (in other words I don't think you should have
bothered with that particular rationale because it just doesn't fly - even
costing the labor at minimum wage and assuming free material and zero
amortized tool costs, it would have been cheaper to buy the blades.)

Just saying....